Abstract
Four disesquiterpenoid-geranylbenzofuranone conjugates, linderalides A-D (1-4), were isolated from Lindera aggregata. Compounds 1-3 represent the first examples of disesquiterpenoid-geranylbenzofuranone hybrids directly linked by two C-C bonds. Linderalide D (4) bears an unprecedented carbon skeleton featuring an unusual linearly 6/6/5/6/6 pentacyclic ring system fused by a sesquiterpenoid unit and a geranylbenzofuranone moiety. Their structures and absolute configurations were elucidated by extensive spectroscopic data and electronic circular dichroism analysis. Their biosynthetic pathways were also proposed.
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